package org.apache.shiro.session.mgt;

import javax.servlet.http.HttpServletRequest;

/**
 * @className: IpUtils
 * @description: IP工具类
 * @date: 2020/5/22
 * @author: cakin
 */
public final class IpUtils {
    private IpUtils() {
    }
    /**
     * 功能描述：获得浏览器所在机器的IP
     *
     * @author cakin
     * @date 2020/5/22
     * @param request 请求
     * @return String IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        if (request == null) {
            return "unknown";
        }
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Forwarded-For");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
}
